Power circuit-breaker

Abstract

The circuit-breaker has a quenching chamber which is filled with an insulating medium, is of cylindrical design and has a quenching zone extending along a longitudinal axis. In addition, it has a fixed contact arrangement, which is arranged in the course of a main current path, and a moving contact arrangement. Furthermore, a blowing volume is provided which stores the increased pressure of the insulating medium which occurs during a disconnection process. At least one contact link, which has two contact points, electrically conductively connects the fixed contact arrangement and the moving contact arrangement to one another in the connected position. The contact link is also mounted to a holder such that it can rotate. The side of the contact link which interacts with the fixed contact arrangement is acted on by a force directed outward in the radial direction with respect to the longitudinal axis.

What is claimed as new and desired to be secured by Letters Patent of the United States is: 
     
       1. A power circuit-breaker comprising: at least one cylindrically constructed arcing chamber which is filled with an insulating medium and has a quenching zone extending along a longitudinal axis,   a fixed contact arrangement which is arranged in a course of a main current path,   a moving contact arrangement having a blowing volume which stores an increased pressure of the insulating medium which occurs during a disconnection process,   at least one contact link having a first side with a first contact point and a second side with a second contact point, said at least one contact link electrically conductively connects the fixed contact arrangement and the moving contact arrangement to one another in a connected position,   wherein the at least one contact link is mounted in a holder such that said contact link can rotate, and   wherein the first side of the at least one contact link which interacts with the fixed contact arrangement is acted on by a force directed outward in a radial direction with respect to the longitudinal axis.   
     
     
       2. The power circuit-breaker as claimed in claim 1, wherein a tension spring is provided for the force which acts radially outward. 
     
     
       3. The power circuit-breaker as claimed in claim 2, wherein the holder is at a shorter distance from the second contact point which interacts with the moving contact arrangement than from the first contact point. 
     
     
       4. The power circuit-breaker as claimed in claim 1, wherein the at least one contact link is arranged in a contact basket. 
     
     
       5. The power circuit-breaker as claimed in claim 1, wherein said moving contact arrangement can form an arc with said contact link when it becomes separated therefrom such that said first side of said contact link overcomes the force acting thereon and said fixed contact arrangement forms an auxiliary arc with said contact link when it becomes separated therefrom.